Apparatus for testing molding sand



p 1948. H. w. DIETERT 2,448,964

APPARATUS FOR TESTING MOLDING SAND Filed April 10, 1944 2 Shee'ts-Sheet 1 INVENTOR. HARRY W.D|ETERT WMZW ATTORNEYS Sept. 7, 1948.

Filed April 10, 1944 FlG.2.,

APPARATUS FOR TESTING MOLDING SAND H. W. DIETERT 2 Sheets-Sheet 2 SEB- H W -1 I I I .l I" H 2 J I2 J M2 M I M M3 I H E H l I "I; 1 4 p II If INVENTOR.

HARRY W. DIETERT ATTORNEYS Patented Sept. 7, 1 948 UNITED sures PATENT enmes- APPARATUS? FoRTEs'rmG-MeLBIiW sane Harry Dietert, Dethoit,.Mieh-.. A plication-111M 1944; swarm; 530,404

(Cl.-7.3--:-16?)I The invention relatesito the testing: of molding.

materialslsmh asmolding sand to determine characteristioswhich afiect theforming ofmolds.

thereof:

More particularly; the: invention: relates to the testing 'ot changes in: volume and strength duet'o" temperature changes and theinvention consistsin: thelnoveli method and apparatus used: for this purpose; as hereinafter described.-

In the: drawings:

Fig: L is a? vertical central section through theapparatus'fer compact'ing the sample to b'e tested; Fig 2 is an elevation: of the apparatus for" heat: and

Figsazisza vertical-section through a portion or In the =testing of moldingsands it is: of 'im'-- which takes pl'a'ce' sit-elevated temperatures.- This Iiacco'mplish as followsi- The-sample to be-tes'ted istpla'cedin airefractory tubesuch as onefo'rm'ed of quartz and is rammedor compressedtoa degree: corresponding i-o-that in a mold. The compressed sample is then placed between abutments in a furnace whichraisesit to a temperature corresponding to that. which it might attain in contact with molten metal. One of the abutments The apparatus used for carryin'g out the'me'thod comprises,.first, the means for compacting th'e samplewit'hin the refractory tube: and; second, ther'meanszforheating the sample and measuring its expansion, the construction being as follows. As shown in Fig. 1, A is a base and B is a cylindrical column rising therefrom and attached thereto by a headed pin C. D is a tubular casing for receiving and reinforcing a quartz tube E in which the sample is to be placed and compacted. The lower end of the casing D is of an internal diameter corresponding to that of the column B which is the same as the internal diameter of the refractory tube E. This permits of sleeving the casing D on the column and temporarily supporting it thereon by a cross pin F with the upper end of the column extending a short distance within the tube E. A bushing G is then placed in the upper end -o'f the casing D 't'o protect-the upper end: of

the:- tube in; The sample tome tested is next pl'acedwithin the tub'e Eand iscompa'ctedby suitable means such as a ram 'H. This maybe a'c-" cornplished Witliout'danger of rupturing" the tube Eas-the latteris reinforcedbythecasinglji The pin-F may then be removed which permits of telescopin -"the casingia over-thecoliimnB there by Withdrawing it from the t'ube 'I iielatter may then be lifted o'fffrom tlie-col 'urrin and trans ferred to the testingapparatus;

Eii'pansz'on measuring apparatus The apparatus for" measuring the expansion' 'is o'f' the-gerieral charekitei of that show-n i'n'- my former Patent 2;279,368"=issued* April' 14 $94 2? It" com rises a frame-including a base I'--' and recs I extendingupward therefrom connected at' theiruppen ends by a cross head 1 Siidabiymounted: 011 the rodsis aifuri'iace J= iscounterbaianced' a weight J "'c'o'nneeted t1iereto by cables J passing ovens'h'eav'es J on the cross: head 1 Between thetwo: rods; I and{ axial alignment; with: the furnace J is: a: rod preferably :formed of refractory material anding to the: internal. diameter of: the: tube: E: so". that thetzlatter: mayFbe placed with its lower. end;

sleeved: uponv said rod: and-with the? compressed sample abutting against the upper end of: the rod; Within the: furnace- J is? anitubulart resistor;

L-similar to thatshown in mytformer patent and: suitable electrical: connections theretokwhich';

need not be described-int detail; The construe tion isvsuchthat the: tubular -resistor may .be heated to the: desired: temperature and 'the funnace then lowered to surround the tube E and sample therein to heat the latter to a corresponding temperature. For measuring the expansion, a gage M is mounted on the upper end of the furnace being adjustably secured to an upwardly extending post M by a clamp M The operating stem M of the gage extends downward and into contact with a rod N formed of refractory material which extends downward into the furnace. This rod is surrounded and reinforced by a refractory tube 0, the upper end of which engages a socket 0' in the top head of the furnace and is secured therein by packing material 0 and a set screw 0 The weight of the rod N is counterbalanced by a spring P which is sleeved about said rod and extends within an enlargement or counterbore P in the tube 0. The lower end of this spring abuts against a shoulder P while its upper end abuts against a collar P secured to the rod N by a set screw P Thus, the spring will support the rod and by adjusting the gage its operating stem may be brought into contact with the upper end of the rod N in its counterbalanced position. I f

Operation In performing the test suitable abutment members N are inserted into the tube E in contact with the upper and lower ends of the sample therein. The tube E with the sample andabutments therein is placed in engagement with the rod K while the furnace J is in an elevated position so as to give proper clearance. nace is then lowered until the lower end of the rod N contacts with the upper abutment member N within the tube E. If in so lowering the furnace a. pressure is placed on the rod N which will move the gage from zero position, this may be adjusted back to zero by adjusting the screw I to lower the piston 13 and the rod K supported thereon. When the sample is heated to the desired temperature, its linear expansion will raise the rod N and through the stem M will operate the gage M to indicate the amountof movement. This completes the test and the furnace may then be raised to remove the sample therefrom.

What I claim as my invention is:

1. In an apparatus for testing the expansion of compacted molding sand when heated, an electric furnace having a tubular. resistor for forming therein a heating chamber, a refractory tube extending downward from the upper end of said furnace into said heating chamber, arefractory rod slidable within said tube and forming with its lower end an abutment for the compacted sample to be tested, a spring sleevedupon said rod with its upper end engaging a collar thereon, said spring being located within a recess in said tube .and abutting against a shoulder of said tube for counterbalancing the weight of said rod, a gage mounted on said furnace in operative relation to the upper end of said rod to measure the displacement thereof, a second refractory rod extending upward within said heating chamber and forming an opposite abutment for the sample to be tested, an open-ended refractory tube in which the sample is compacted telescopically engaging said refractory rods, and means for supporting said furnace for relative movement with respect to said second refractory rod to afford access to the open ended refractory tube containing the-sample.

2. In an apparatus for testing the linear expansion of a compacted sample when heated, a

The furfurnace having a heating chamber, a refractory tube secured to and extending downward from the upper end of said furnace into said heating chamber, a refractory rod slidable within said tube, the lower end of said rod constituting one abutment for the sample to be tested, counterbalancing means for said rod within said tube between abutments on the rod and tube, a gage mounted on the furnace in operative relation tothe upper end of said slidable rod to measure the displacement thereof, a second refractory rod extending upward within said heating chamber in alignment with said slidable rod, the upper end of said second rod constituting a second abutment for the sample to be tested, an open ended refractory tube in which the sample is compacted receiving adjacent ends of said rods, and means for supporting the furnace for relative movement with respect to the second rod to afford access to the open ended refractory tube containing the sample. I

3. In an apparatus for testing the linear expansion of a compacted sample when heated, a furnace having a heating chamber, an upright refractory tube secured to said furnace and extending into said heating chamber, a refractory rod slidable within and projectingbeyond one end of said upright tube, one end of said rod constituting one abutment for the sample to be tested, counterbalancing means forsa'id rod at the other end of said upright tube, a gage mounted on the furnace in operative relation to said slidable rod to measure the displacement thereof,

a second refractory rod extending within said heating chamber in alignment with said slidable rod, one end of said second rod constiututing a second abutment for the sample to be tested, an open ended refractory tube in which the sample is compacted receiving adjacent ends of said rods, and means for supporting the furnace for relative movement with respect to the second rod to afford access to the open ended refractory tube containing the sample.

HARRY W. DIETERT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,065,108 Blaul et al June 17, 1913 1,434,500 Pearce et al Nov. 7, 1922 1,444,567 Sperr Feb. 6, 1923 2,157,194 Webber et al. May 9, 1939 2,279,368 Dietert Apr. 14, 1942 2,280,966 Nad-ai et al. Apr. 28, 1942 2,290,868 Eriksson July 28, 1942 2,336,286 Owen Dec. 7,1943 2,351,572 Kingston June 13, 1944 

